package cn.com.wf.action;

import java.io.ByteArrayInputStream;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.activiti.bpmn.converter.BpmnXMLConverter;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.editor.constants.ModelDataJsonConstants;
import org.activiti.editor.language.json.converter.BpmnJsonConverter;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.repository.Model;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
/**
 * 流程模型控制器
 */
@Controller
@RequestMapping(value = "/wf/model")
public class ModelAction {
	 
	 
	  @Autowired
	  RepositoryService repositoryService;

	  /**
	   * 模型列表
	   */
	  @RequestMapping(value = "list")
	  public ModelAndView modelList() {
	    ModelAndView mav = new ModelAndView("workflow/model-list");
	    List<Model> list = repositoryService.createModelQuery().list();
	    mav.addObject("list", list);
	    return mav;
	  }
	 
	  /**
	   * 创建模型
	   */
	  @RequestMapping(value = "create")
	  public void create(@RequestParam("name") String name, @RequestParam("key") String key, @RequestParam("description") String description,
	          HttpServletRequest request, HttpServletResponse response) {
	    try {
	      ObjectMapper objectMapper = new ObjectMapper();
	      ObjectNode editorNode = objectMapper.createObjectNode();
	      editorNode.put("id", "canvas");
	      editorNode.put("resourceId", "canvas");
	      ObjectNode stencilSetNode = objectMapper.createObjectNode();
	      stencilSetNode.put("namespace", "http://b3mn.org/stencilset/bpmn2.0#");
	      editorNode.put("stencilset", stencilSetNode);
	      Model modelData = repositoryService.newModel();
	 
	      ObjectNode modelObjectNode = objectMapper.createObjectNode();
	      modelObjectNode.put(ModelDataJsonConstants.MODEL_NAME, name);
	      modelObjectNode.put(ModelDataJsonConstants.MODEL_REVISION, 1);
	      description = StringUtils.defaultString(description);
	      modelObjectNode.put(ModelDataJsonConstants.MODEL_DESCRIPTION, description);
	      modelData.setMetaInfo(modelObjectNode.toString());
	      modelData.setName(name);
	      modelData.setKey(StringUtils.defaultString(key));
	 
	      repositoryService.saveModel(modelData);
	      repositoryService.addModelEditorSource(modelData.getId(), editorNode.toString().getBytes("utf-8"));
	 
	      response.sendRedirect(request.getContextPath() + "/modeler.html?modelId=" + modelData.getId());
	    } catch (Exception e) {
	    	e.printStackTrace();
//	      logger.error("创建模型失败：", e);
	    }
	  }
	 
	  /**
	   * 根据Model部署流程
	   */
	  @RequestMapping(value = "deploy/{modelId}")
	  public String deploy(@PathVariable("modelId") String modelId, RedirectAttributes redirectAttributes) {
	    try {
	      Model modelData = repositoryService.getModel(modelId);
	      ObjectNode modelNode = (ObjectNode) new ObjectMapper().readTree(repositoryService.getModelEditorSource(modelData.getId()));
	      byte[] bpmnBytes = null;
	 
	      BpmnModel model = new BpmnJsonConverter().convertToBpmnModel(modelNode);
	      bpmnBytes = new BpmnXMLConverter().convertToXML(model);
	 
	      String processName = modelData.getName() + ".bpmn20.xml";
	      Deployment deployment = repositoryService.createDeployment().name(modelData.getName()).addString(processName, new String(bpmnBytes)).deploy();
	      redirectAttributes.addFlashAttribute("message", "部署成功，部署ID=" + deployment.getId());
	    } catch (Exception e) {
	    	e.printStackTrace();
//	      logger.error("根据模型部署流程失败：modelId={}", modelId, e);
	    }
	    return "redirect:/wf/model/list.action";
	  }
	 
	  /**
	   * 导出model的xml文件
	   */
	  @RequestMapping(value = "export/{modelId}")
	  public void export(@PathVariable("modelId") String modelId, HttpServletResponse response) {
	    try {
	      Model modelData = repositoryService.getModel(modelId);
	      BpmnJsonConverter jsonConverter = new BpmnJsonConverter();
	      JsonNode editorNode = new ObjectMapper().readTree(repositoryService.getModelEditorSource(modelData.getId()));
	      BpmnModel bpmnModel = jsonConverter.convertToBpmnModel(editorNode);
	      BpmnXMLConverter xmlConverter = new BpmnXMLConverter();
	      byte[] bpmnBytes = xmlConverter.convertToXML(bpmnModel);
	 
	      ByteArrayInputStream in = new ByteArrayInputStream(bpmnBytes);
	      IOUtils.copy(in, response.getOutputStream());
	      String filename = bpmnModel.getMainProcess().getId() + ".bpmn20.xml";
	      response.setHeader("Content-Disposition", "attachment; filename=" + filename);
	      response.flushBuffer();
	    } catch (Exception e) {
	    	e.printStackTrace();
//	      logger.error("导出model的xml文件失败：modelId={}", modelId, e);
	    }
	  }

    @RequestMapping(value = "delete/{modelId}")
    public String delete(@PathVariable("modelId") String modelId) {
        repositoryService.deleteModel(modelId);
        return "redirect:/wf/model/list.action";
    } 
}
